26660988 has 84 divisors (see below), whose sum is σ = 71980608. Its totient is φ = 8631360.

The previous prime is 26660951. The next prime is 26660993. The reversal of 26660988 is 88906662.

It is a super-2 number, since 2×26660988² = 1421616562272288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 119445 + ... + 119667.

It is an arithmetic number, because the mean of its divisors is an integer number (856912).

Almost surely, 2^26660988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26660988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35990304).

26660988 is an abundant number, since it is smaller than the sum of its proper divisors (45319620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26660988 is a wasteful number, since it uses less digits than its factorization.

26660988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 26660988 is about 5163.4279311326. The cubic root of 26660988 is about 298.7391079285.

The spelling of 26660988 in words is "twenty-six million, six hundred sixty thousand, nine hundred eighty-eight".